直接写得数．
12÷4= 0.9÷0.001= 12﹣7.2﹣2.8= 1.25×0.8×0.5=
2.56﹣1.37= （1.25+0.36）×0.2= 5.4﹣2.5﹣1.4= 4.2÷0.01=
1.25×9.2×0.8= 6.6÷2.2= 0.43+1.7+3.3= 7.5×2.5×4=
直接写得数．
12÷4= 0.9÷0.001= 12﹣7.2﹣2.8= 1.25×0.8×0.5=
2.56﹣1.37= （1.25+0.36）×0.2= 5.4﹣2.5﹣1.4= 4.2÷0.01=
1.25×9.2×0.8= 6.6÷2.2= 0.43+1.7+3.3= 7.5×2.5×4=
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